* {
  padding: 0;
  margin: 0;
  font-size: 20px;
}
.box {
  width: 100%;
  height: 100%;
  .header_box {
    width: 100%;
    height: 2.5rem;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 99;
  }
  .main_box {
    width: 100%;
    min-height: 27.6rem;
    overflow-y: scroll;
    overflow-x: hidden;
    position: absolute;
    top: 2.5rem;
    bottom: 3.2rem;
    left: 0;
    right: 0;
  }
  .footer_box {
    width: 100%;
    height: 3.2rem;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    border-top: 1px solid #e6e6e6;
    background: #fff;
  }
}
